Dallas Arboretum Trial Gardens
- Provides research information about plants and trial results to the public and the horticulture industry.
- http://www.dallasplanttrials.org/

Dallas Master Gardeners
- Includes contacts, newsletters, and gardening resources.
- http://www.dallasmastergardeners.org/

Texas Discovery Gardens
- Features acres of native and adapted plants. Also provides educational programs and activities including programs for school and youth groups, a butterfly habitat program, adult workshops, and free concerts.
- http://www.texasdiscoverygardens.org/

The Dallas Arboretum and Botanical Garden
- Features landscaped acres of trees, gardens, and lawns, with fountains, sculptures, and historic mansions. Site includes membership information, photos of each garden, and information about educational programs.
- http://www.dallasarboretum.org/

University of Texas at Dallas,
- Geographic Information Science Center at UTD.
- http://www.bruton.utdallas.edu/educ/

Texas Astronomical Society
- Society chartered in 1955 to promote the study of astronomy and related fields and to pursue observation and construction of instruments as a hobby.
- http://www.texasastro.org/

Dallas Regional Science and Engineering Fair
- One of the largest regional student fairs in the United States
- http://dallassciencefair.org/

Dallas Zoo
- 8000 animals on 97 acres. Includes children's zoo. General information, zoo map, exhibit overview, class summary, special events, and conservation information.
- http://www.dallas-zoo.org

North Texas Clean Air Coalition
- Promote voluntary actions to help improve air quality in the North Texas Region. Features news, air pollution watch or warning status, and contact information.
- http://www.northtexasair.org/